Please help me to identify the seed. I attach the image of the pod. It was found near the ocean's beach in Boston. I would appreciate any input.
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That thing is pretty cool looking - had you not identified it as a plant or pod, I would almost think it could be a very bitey fossilized specimen! – PhasedOut Mar 17 '17 at 19:43
These are seeds from Trapa natans or "Water Caltrop" or "European Water Chestnut". You're good at finding invasive plant seeds! :)